Adsorption and Removal of Phosphate by Leather Collagen Fiber-based Material Loaded with UiO–66–NH₂

The resource utilization of tannery waste is beneficial to the sustainable development of leather industry, and the removal of phosphate from phosphorus-containing wastewater is of great significance to environmental protection. A leather collagen fiber-based adsorbent (LS@SA@UiO–66–NH₂) was successfully prepared by using tannery waste (LS, mainly collagen fibers) as the base material, sodium alginate (SA) as the network framework, and UiO–66–NH₂ as the functional component. Characterization analysis showed that the adsorbent was successfully prepared, and its optimal adsorption pH for phosphate was 3. The adsorption isotherm conformed to the Langmuir equation, and the maximum theoretical adsorption capacity reached 119.82 mg/g at 318 K. The quasi-secondary kinetic model can better describe the adsorption process, and the adsorption mechanism mainly involves the electrostatic adsorption and ligand exchange interactions. In addition, the experiments of coexisting ion competition, recycling performance and actual water sample adsorption proved the practical application potential of LS@SA@UiO–66–NH₂. This study not only prepared a new material of adsorbent for treating phosphorus-containing wastewater, but also put forward a new idea of waste resource utilization, which is helpful to promote the construction of an environmentally friendly society and the sustainable development of leather industry.